// 定义变量
@font-family: system-ui, Avenir, Helvetica, Arial, sans-serif;
@primary-color: #646cff;
@primary-hover-color: #535bf2;
@dark-bg-color: #242424;
@light-bg-color: #ffffff;
@dark-text-color: rgba(255, 255, 255, 0.87);
@light-text-color: #213547;
@button-bg-dark: #1a1a1a;
@button-bg-light: #f9f9f9;
@light-hover-color: #747bff;

:root {
    font-family: @font-family;
    line-height: 1.5;
    font-weight: 400;

    color-scheme: light dark;
    color: @dark-text-color;
    background-color: @dark-bg-color;

    font-synthesis: none;
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    font-weight: 500;
    color: @primary-color;
    text-decoration: inherit;

    &:hover {
        color: @primary-hover-color;
    }
}

body {
    margin: 0;
    display: flex;
    place-items: center;
    min-width: 320px;
    min-height: 100vh;
}

h1 {
    font-size: 3.2em;
    line-height: 1.1;
}

button {
    border-radius: 8px;
    border: 1px solid transparent;
    padding: 0.6em 1.2em;
    font-size: 1em;
    font-weight: 500;
    font-family: inherit;
    background-color: @button-bg-dark;
    cursor: pointer;
    transition: border-color 0.25s;

    &:hover {
        border-color: @primary-color;
    }

    &:focus,
    &:focus-visible {
        outline: 4px auto -webkit-focus-ring-color;
    }
}

@media (prefers-color-scheme: light) {
    :root {
        color: @light-text-color;
        background-color: @light-bg-color;
    }

    a:hover {
        color: @light-hover-color;
    }

    button {
        background-color: @button-bg-light;
    }
}